All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
If you didn`t buy this plot of land for trade-as understood from your question-then no Zakah is liable on it. This is because the intention of selling that land is what makes it liable for Zakah and, in your case, this condition is missing.
Al-Shirbini says: "If the commodity is bought to be sold then it is considered an item of trade." (Moghni al-Mohtaj, vol.1/pp.588).
In conclusion, no Zakah is due on this land because it wasn`t bought with the intention of selling all of it or a portion of it. And Allah The Almighty Knows Best.